DESCRIPTION

This function will register a cipher algorithm to be used by
gnutls. Any algorithm registered will override the included
algorithms and by convention kernel implemented algorithms have
priority of 90 and CPU-assisted of 80. The algorithm with the lowest priority will be
used by gnutls.

In the case the registered init or setkey functions return GNUTLS_E_NEED_FALLBACK,
GnuTLS will attempt to use the next in priority registered cipher.

The functions registered will be used with the new AEAD API introduced in
GnuTLS 3.4.0. Internally GnuTLS uses the new AEAD API.